I have lots on the wall, I used that gummy blue stuff that comes in small packages. I think the shinier your wall, the harder it is for stuff to stick, but that blue stuff works great for me. I also have drilled small holes in the cd's and strung them up, so they hang vertically. It required several drill bits and alot of cracked CD's but I was able to do it. I did have someone donate a box of 500 CD's, from a flawed general ledger run at a local business, so I had lots of CD's to work with. Many CD-type ornaments on the tree at church, too!